Movatterモバイル変換
[0]ホーム
[Python-ideas] suggestion about the sort() function of the list instance
Soni L.fakedme+py at gmail.com
Tue Feb 28 19:30:37 EST 2017
On 28/02/17 09:13 PM, Steven D'Aprano wrote:> On Mon, Feb 27, 2017 at 11:07:33AM +0800, qhlonline wrote:>> Hi, all>> I have a suggestion that, the sort() member method of the list>> instance, should return the 'self' as the result of list.sort()>> call.> Having list.sort() and list.reverse() return self is a perfectly good> design. The advantage is you can write things like this:>> list.sort().reverse()>> but the disadvantage is that it may fool people into thinking it returns> a *copy* of the list. Python avoids that trap by returning None, so that> you cannot write:>> sorted_items = items.sort()>> but instead people write:>> items = items.sort()>> so it seems that whatever we do, it will confuse some people.>>>> Now list.sort() returns nothing, so that I can NOT write>> code like this:>>>> res = {item: func(item) for item in item_list.sort()}> What is the purpose of the sort? Because dicts are unordered, the> results will be no different if you just write:>> d = {item: func(item) for item in item_list}>>Stateful functions?
More information about the Python-ideasmailing list
[8]ページ先頭